[1medic]

If you use Mobil 1 5w/40 and use an extended oil change interval (over 7500) and use OA's or not I want to hear your story about what your experience is.

 

[work&play]

I use it but change it at 5,000 miles and have had good OA's. My truck weights almost 12,000 lps. every day and when I tow sometimes a GCVW of 22-23,000 lbs. so it is worked . I also have a SCT with costom tunes from Inovative Diesel.

 

[RatherBNtheWoods]

I use Mobil1 sometimes, but never extend the oil changes. I like REAL synthetic oil, as is Mobil1, but the 6oh seems to be hard and dirty on oil.

 

[fastgnat]

I use Mobil 5w/40. Since the ultra low sulfer fuel came out I tried just changing the filter every 5k, and not exceeding 10k for an oil change based on the condition of the oil. It's been over a year and no problems.

 

[HeavyAssault]

I have used Mobil 1 for intervals of 7500 not to exceed 10k with a by-pass filter kit. I'm really happy with the results and will go back to Mobil 1 at the next change. I cant seem to find it on the shelves as of late.

 

[fastgnat]

I had to order mine from somewhere in Ohio because seemed like no one around north FL had it on their shelf.